add set/ get volume eus method

[kochigami]

• methods for get/ set output volume
• requires
  [srv] add set/get volume ros-naoqi/naoqi_bridge_msgs#34
  add services for get and set volume ros-naoqi/naoqi_driver#89

2.irteusgl$ send *ri* :get-volume
30
3.irteusgl$ send *ri* :set-volume 30
t

[kochigami]

ref: ros-naoqi/naoqi_driver#97

[kochigami]

• Requirements
  https://github.com/kochigami/naoqi_driver/tree/kochigami-develop
  nao_interaction_msgs from source

original PR is ros-naoqi/naoqi_driver#110, but it will take some time to be merged and it is included in kochigami-develop

• Tested with NAO 2.4.3 Pepper 2.5.5, ROS kinetic

roslaunch jsk_pepper_startup jsk_pepper_startup.launch ...
roseus pepper-interface.l
pepper-init 
send *ri* :set-master-volume 40
send *ri* :get-master-volume

• TODO
• add explanation about kochigami-develop [jsk_naoqi_robot/README] Add explanation of roseus interface methods #1000
• add explanation about these functions [jsk_naoqi_robot/README] Add explanation of roseus interface methods #1000
  (link to NAOqi documentation)
  (I have to check one more because my head went explode while resolving conflicts...)

[kochigami]

@k-okada
Could you please merge this when you have time?